അർത്ഥം : An event in which one thing is substituted for another.
							ഉദാഹരണം : 
							The replacement of lost blood by a transfusion of donor blood.
							
പര്യായപദങ്ങൾ : replacement, substitution, switch, transposition
അർത്ഥം : The act of changing the arrangement of a given number of elements.
അർത്ഥം : Complete change in character or condition.
							ഉദാഹരണം : 
							The permutations...taking place in the physical world.
							
അർത്ഥം : Act of changing the lineal order of objects in a group.